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  1. bertus

    Air variable capacitors

    Hello, There is speciality shop where there are many available: https://www.die-wuestens.de/dindex.htm?/k6.htm Bertus
  2. bertus

    L298n connecting in parallel

    Hello, Here I have the grounds connected: Bertus
  3. bertus

    L298n connecting in parallel

    Hello, You could parallel two channels of the L298 to drive one pump: The complete schematic would be this for the 4 pumps: Bertus
  4. bertus

    L298n connecting in parallel

    Hello, I found this page: https://www.aliexpress.com/item/32770860268.html?spm=a2g0o.store_pc_home.productList_581540402.pic_1 It looks it is a chinese company. I also found this on the page: What Kind Of adapter is necessary to 12 volt 1-2 A it's just a DC motor Solder and DC 12v Bertus
  5. bertus

    L298n connecting in parallel

    Hello, As @Alec_t said, the start-up (stall) current can be much higher. The start-up current can be upto 5 times the running current. So 2 Amp for each pump. Do you have details on the used pump? Are there other currents given in the datasheet? Bertus
  6. bertus

    L298n connecting in parallel

    Hello, Why not use a higher power driver? This one could handle it easy: https://www.robotshop.com/nl/en/dc-motor-driver-2-15a.html Bertus
  7. bertus

    Increase the amperage fo PNP transistor

    Hello, Have a look here about two transistors as Compound Pair (aka. Sziklai pair) or Darlington Pairs: https://sound-au.com/articles/cmpd-vs-darl.htm Bertus
  8. bertus

    Tacx T2240 turbo trainer - blown resistor

    Hello, The size will determine the wattage. This page will give you some info: https://www.newmatik.com/knowledge-base/KB-EN-00928/resistor-case-sizes Bertus
  9. bertus

    Tacx T2240 turbo trainer - blown resistor

    Hello, 223 is the code for 22 kOhms. 3R3 is the code for 3.3 Ohms. https://circuitspedia.com/resistor-working-types-of-resistor-color-code/ Bertus
  10. bertus

    Inverting a modulated signal (OOK).

    Hello, as @AnalogKid said, there is usualy a resistor in the feedback. Have a look at this TI note: https://e2e.ti.com/support/logic-group/logic/f/logic-forum/91055/classic-4093-schmitt-trigger-gated-oscillator-trouble Bertus
  11. bertus

    Inverting a modulated signal (OOK).

    Hello, Each gate will have a delay. Wich type of gate are you using? There are several types with different delay times. Bertus
  12. bertus

    COVID-19

    Turk sets unenviable COVID-19 record by testing positive for 14 straight months https://www.channelnewsasia.com/world/turk-sets-unenviable-covid-19-record-testing-positive-14-straight-months-2497991
  13. bertus

    And now something weird

    Birds falling from the sky:
  14. bertus

    Re-attaching wire to multi-pin connector

    Hello, You could push out the metal part in the connector: I see that @Harald Kapp also mentioned the same. Bertus
  15. bertus

    Is voltage negotiation required?

    Hello, Did you read this section: The USB Power Delivery specification revision 2.0 (USB PD Rev. 2.0) has been released as part of the USB 3.1 suite.[58][66][67] It covers the USB-C cable and connector with a separate configuration channel, which now hosts a DC coupled low-frequency BMC-coded...
  16. bertus

    Is voltage negotiation required?

    Hello, USB-C has the capability of delivering 9 Volts or even more: https://en.wikipedia.org/wiki/USB_hardware#USB_Power_Delivery Bertus
  17. bertus

    Farfisa Vip 200 R problem

    Hello, The circled capacitor is 470 pF. I never had any problems with those styroflex capacitors. It would help if you could give us the type numbers of the chips in the citcuit. On the output of the oscillator there will be an AC voltage, so it can not be measured with a DMM. An oscilloscope...
  18. bertus

    Faulty LED driver (BREL-2D-36T)

    Hello, There will be a cause of the failing of the diode. I also see a three legged element. It could be a transistor or mosfet that failed too. Bertus
  19. bertus

    Faulty LED driver (BREL-2D-36T)

    Hello, When it reads a short out of circuit, the diode is faulty. Bertus
  20. bertus

    Faulty LED driver (BREL-2D-36T)

    Hello, Did you measure the diode out of circuit? An in circuit measurement may fool you. Bertus
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